That video of Jos Verstappen's pitstop fire is quite disturbing. That fire was partially caused by the fueling rig that had been tampered by removing a filter to allow faster refueling.

Here's another disturbing pitstop fire of Heikki Kovalainen leaving the pit stall with the fueling hose still attached and the fuel gets sprayed on his compatriot Kimi Räikkönen, who went on to finish the race in 5th spot. http://www.youtube.com/watch?v=OvgjhfQLTNk http://www.youtube.com/watch?v=Hzg_9UXo9s8

Trying to refuel 50 liters (15 gallons) or more in less than 10 seconds is bound to be dangerous.